Lenovo G780 Freezing and other problems

Hello everyone,
I have a Lenovo G780 from an year and a half and I've been experiencing some severe problems with it.Just so you guys know 4 months ago I spilled a small quantity of yoghurt on the touchpad and under the laptop directly to the vents or little panel exits not sure what it's called..
So I went to some technicians they diagnosed my laptop with some hardware problem because of that and that there was a need of cleaning the inside because this "problem" will grow in time.I put problem in quotation marks because the spilled yoghurt was not that much but it might have affected some important and significant parts of the laptop (I'm definitely not an expert).
As time passed by and me rejecting to clean and make some hardware repairments to my laptop there was nothing else but the usual "freezing" when I was away for 5-10 minutes while the charger was plugged in .That occurred even before the yoghurt damage but I have to admit sometimes after I played 3 hours straight some game the laptop was like a heated stove and would just stop working and forcing me to restart.Other than that my lan card was fried and that's when I went to the computer specialists for diagnosis.
So now 2 months later I'm using the casual wi-fi connection but suddenly my laptop started freezing without even being hot.It would just freeze while me watching a movie I can move the cursor but when I click something it freezes "forever".I tried waiting scaning looking at Bios searching for some other people with the same problem and a solution.Unfortunately things got worse cause the same day after a lot of restarts and the laptop freezing after 5 minutes of being switched on, it degraded to freezing at the moment all startup programs were started and it stops.I shut it down waited an hour but it kept doing that(I haven't made any unwanted changes in BIOS).Now things are horrific.After this continued on , suddenly the laptop freezes on the Windows 8 loading icon before the "enter your password" stage.
Please help me and tell me what should I do cause I have some serious work to do and right now I can't even reach my desktop.Thank you in advance.

Thanks.Useless forum , I don't even know why I posted a topic here.

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